@mixin flex {
  display: flex;
  align-items: center;
  flex-flow: column wrap;
  justify-content: center;
}

// 定义宽高值，历遍1-1000
@for $i from 1 through 1000 {
  .a-#{$i} {
    @include flex;
    width: $i + rpx;
    height: $i + rpx;
  }
}

.full {
  width: 100%;
  height: 100%;
}
